If a gate fails to respond due to incorrect sensor inputs, which failure mode is most likely?

• A. End-of-travel sensing
• B. Motor stall or overheating
• C. Controller failure
• D. Sensor fault

Answer: (D)

When the system fails to respond because the sensor readings are incorrect, the most likely issue is a sensor fault. The controller relies on sensor data to decide when to move, stop, or reverse. If a sensor is dirty, misaligned, damaged, or has faulty wiring or signal conditioning, it can feed the wrong information into the controller, leading to no response or improper behavior.

End-of-travel sensing is a specific sensor function; if that sensor alone were bad, you’d see issues related to hitting or missing the end position, not necessarily general incorrect inputs across the system. Motor stall or overheating points to problems in the drive mechanism itself, not the quality of sensor data. A controller failure would affect a broader set of operations and wouldn’t be described primarily as incorrect sensor inputs.